A useful method is given which can count the least positive period of a continuous function by Fourier coefficients.
给出了一个利用福里哀系数求非常值的连续周期函数的最小正周期的有效方法。
Horizontal well is the most effective method for tapping the rich residual oil zone on the top of thick positive rhythm reservoir in extra-high water-cut period.
水平井技术是挖潜特高含水期正韵律厚油层顶部剩余油富集区最为有效的方法。
Using method of integral regression, effect of varying amounts per factor on annual yield and period of positive or negative effect during each growing stage of grasses were given.
用积分回归法分析了牧草生长发育各时段单位因子变化量对年产量的影响程度及正负效应时段。
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